Lifting-jack



LE HOY WILLOUR.

LIFTING JACK.

APPLICATION FILED SEPT 12,1919.

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LE ROY WILLOUR.

LIFTING JACK.

. APPLICATION FILED SEPT I2, i919.

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Paten Am'. 5, E921.

LE ROY WILLOUR. 'LIFTING JACK. APFLICATIONHLEDSEPT12,1919.

l L', Patented Apr. 5, 1921.

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LE ROY WILLUR.

LIFTING JACK.

APPLICATION FILED SEPT I2, I9I9.

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LE ROY WILLOUR, OF ASHLAND, OHO, ASSIGNOR TO THE ASHLAND PRODUCTS COMPANY, 0F ASHLAND; OHO, A CORPORATION OF OHIO.

:MEETING-JACK.

Specification of Letters Patent.

lPateiitedApr. 5,' 1921.

Application filed September 12, 1919. Serial No. 323,271.

rFhis invention relates to improvements in lifting jacks. Y

An important object of the invention is to provide a ack, the entire operating mechanism of which is carried'by the handle re ceivng socket, whereby the operating mechanism may be readily removed for inspection or repair.

A further object is to provide a jack, the operating mechanism `of which, is so arranged tliat the hoisting bar of the jack may be elevated to contact the work without coni-` iiig in Contact with the operating mechanism, thereby saving wear upon the various parts thereof.

A. further object isa provision of a jack, the operations of which are controlled by the handle.

Other objects and advantages will be apparent` during the course of the following discussion. p

1n the accompanying drawings wherein for the purpose of illustration isshown a preferred embodiment of my invention and wherein like numerals designate like parts throughout Figure 1 is a side elevation of a jack einbodying my invention. w

Fig. 2 is a side elevation taken from the opposite side of the jack a portion of the casing being removed for the purpose of clarity.

Fig. 3 is a view similar to that shown in Fig. 1, a portionof the casing being removed, and the operating mechanism slown in the normal positions in full lines and in the hoistingy position by dotted lines.

Fig. l1 is a View similar to that shown in Fig. 3, showing in full and dotted lines the raised and lowered positions of the handle socket and its associated mechanism. when the handle is in the hoisting position. l

Fig. 5 is a View similar to that shown in `Fig. 3, showingthe handle socket and its Fig. 6 is a section taken on the line y66 of Fig. 3.

Fig. 7 is an enlarged section taken on the line 7e-7 of Fig. e. i

Fig. 8 is a combined perspective showing the casing and lifting bar. Y f

Fig. 9 isa combined perspective Vof the operating pawls and the spring actuating the same.

Fig. 10 is a perspective of the reversing lever.

. Fig. 11 is a perspective of the operating end of the ack handle illustrating the portionV engaging the 'reversing lever during the hoisting operation, and

Fig. 12 is a perspective similar to that shown in F ig. 10 illustrating the groove which receives the reversing lever during the lowering operation. A y,

Referring now more particularly to the drawing, the numeral 10 indicates a suitable standard having a hase 11. rlrhe standard 10 is provided with a vertical tubular opening 12 adapted to receive alifting bar 13 having formed upon one side thereof a rack 14:.k

Formed upon one side of the standard 10, and extending outwardly therefrom, is a mechanism casing 15. This casing is provided upon one side with an opening, the Side walls of which are provided with out-r standing ears 16 `adapted to co-act with recesses 17 formed in a complementary casing 18. .The complementary casing 18 is provided with lugs 19 having Vopenings k20 formedtherein adapted to cooperate with openings 21 formed in the casing 15 to receive a shaft 22. l

It' will be noted that the lugs 19 close sides of the recesses 17 formed in the coinpleinentary casing 18 and that the ears 16 formed on the casing 15 tend to strengthen the metal adjacent the openings 21 formed in the casing. The shaft 22 serves to secure the casing 18 to the casing 15.

Rotatably mounted upon the shaft 22'is a ratchet wheeli23. Secured toor formed in-L tegrally with the ratchetwheel 23 is a pinion 2e,- the teeth of which engage the rack 1a of the hoisting bar 13. 1f desired the casing 18 where it incloses the pinion 2e may be reduced as at 25.

Formed in the casing 15 are openings 26 adapted to receive a shaft 27. A handle receiving socket 28 is provided Vhaving formed clined as at 34.

l/ounted in the arms 29 adjacent the inner ends thereof is a pin 35. An operating pawl 36 is provided having openings 37 formed therein adapted to receive the pin 35. The pawl 36 is provided with an aperture 38 similar to the aperture 33 of the pawl 31. A spring 39 is provided having loops 40 and 41 formed therein adapted to `receive re spectively the pin 35 and shaft 27. The spring is mounted about these shafts within the openings 38 and 33 of the pawls 36 and 31 respectively and the ends ofthe spring 41 and 43 engage the pawls having a tendency to throw them inthe position shown by dotted lines in Fig.V 3.

Depending from the handle receiving socket 28 is a reverse lever casing 44. The lower wall 45 of the socket 28 is provided with a slot 46 connecting the interior of the socket 28 with the interior oithe casing 44. A pin .47 is mounted in the lower wall of the socket 28 and extends transversely of the slot 46.

A reverse lever 48 is provided having a reduced portion 49 adapted to be received by the slot 46 and this'reduced portion is provided with an opening 50 adapted toreceive the pin 47, to pivot the reverse lever. The reverse lever is provided with a cam face 51 adapted to coperate with the incline tace 34 of the holding pawl 31, and a downwardly inclined portion 52 adapted to co-act with the lowerend of the operating pawl 36. Upon its end face the reverse lever 48 is provided with a lug 53 adapted toco-act with a lug 54 formed upon the inner face ol' the reverse lever casing 44 to receive a compression spring 55. The upper face of the reduced portion 49 of the reverse lever presents an incline surface having its lower portion adjacent the entrance of the handle socket 28.

The handle 56 is providedA upon one side of its end with a groove 57 adapted to receive the upper face of the reduced portion 49 of the reverse lever 48, as is clearly shown by the dotted lines in Fig. 5. This groove when adjacent the reverse lever prevents the handle from exerting any influence whatever upon the lever. The opposite side of the end of the handle is provided with an incline face 58 which engages the incline face of .of the ratchet wheel 23.

the reduced portion 49 of the lever causing the lever to assume the position shown in 'Il'ull lines in Fig. 4 and in dotted lines in The operation ot' my device is as follows:

`lil/'hen the handle socket 28 is in the normal position or the position shown in Fig. 3, such position being intermediate the raised and lowered position, the reverse lever 48 en gaging the pawls withdraws them to the p0- sition shown by the full lines in Fig. 3. As previously stated `when the handle is inserted withthe groove 57 adjacent the lever, the lever is in no'way effected and the pawls remain in the position shown. It, however, the handle is inserted with the incline face 58, adjacent the lever, the reverse lever 48 is shifted to the position shown by the dotted lines in Fig. 3 and the full lines in Fig. 4. TWhen the socket is in the dotted position shown in Fig. 3 both pawls, actuated by thespring 39, are` thrown into engagement with the teeth of the ratchet wheel. 1f the handle is raised, the socket 28 assumes the position shown by solid lines in Figs. 4 and 5 and upward movement is limited by a p0rtion of the upper tace 61 of the socket coming into contact with a portion 62 of the casing 15. The pawl 36 being pivoted at the outer endsot the arms 29 is drawn downwardly to engage in the next lower tooth of the ratchet wheel 23 as is shown in Fig. 4.

he handle then being depressed, the pawl 36 again rises shifting the ratchet wheel one tooth in the direction of the arrow on Fig. 4. seen that the socket 28 is provided with a lug 63 adapted to engage against the edge 64 of the casing 15 and limit downward movement of thesocket. It will bev readily seen that continuation of the operation above described will rotate the ratchet wheel `23 in the direction of the arrow in Fig. 4 and that this rotation is transmitted to the pinion `24 and the lifting bar 13 is raised.

Referring now to Fig. 5 and assuming the j aokV to be under load and the handle to be inserted with the groove 57 adjacent the lever 48, when the handle is lifted, the pawl 31 is thrown into engagement with the teeth As. the handle is lowered the tendency of this pawl is to withdraw from the tooth which it engages but the pawl is held from so doing by the weight thereon acting against this tendency. rlhe cam face 51 of the reverse lever engages the incline face 34 of the pawl 31. i As the handle is lowered this pawl being held By referring to Fig. 1 it will be against movement the cam face 51 slides slightly allowing theV pawl 31 to` escape to the dotted lines shown in Fig. 5. When they handle is again raised, the wheel is lowered one tooth, and the pawl 31 again engages. It will be obvious that continuation of the above operations will allow the lifting bar 13 -to lower. As soon as the load is released from the jack the pawl 31 will withdraw by virtue of the spring 55, operating through the reverse lever 48, cam face 51, andincline face 34, allowing the lifting bar to drop to its lowermost position.

It will be obvious to those familiar with the art that instead of operating the lifting bar 13 by means of ratchet wheel 23 and pinion 24, the pawls 31 and 36 might engage directly with the rack formed upon the lifting bar.

As many changes are possible in the shape, size, and arrangement of parts, I do not limit myself to the specific construction 1 herein shown and described but may make any such changes without departing from the spirit of the invention or the scope of the subjoined claims.

`What I claim is:

1. In a lifting jack, a standard, a lifting bar mounted for vertical reciprocation therein, a ratchet adapted to actuate said bar, a shaft mounted on said standard, a handle receiving socket pivoted upon said shaft and having a pair of spaced arms, a pawl pivoted upon said shaft intermediate said arms, a pin mounted in said arms, a second pawl pivotally mounted upon said pin a spring engaging said pawls and tending to force them into engagement with said ratchet, a reverse lever pivoted to said socket and normally engaging said pawls and withdrawing them from engagement with said ratchet and means for withdrawing said lever from engagement with said pawls. i

2. In a lifting jack, a standard, a lifting bar mounted for vertical reciprocation therein, a ratchet adapted to actuate said bar, a shaft mounted in said standard, a handle receiving socket pivoted upon said shaft and having a pair of spaced arms, a pawl pivoted upon said shaft intermediate said arms, a pin mounted in said spaced arms, a second pawl pivoted thereto, a spring engaging said pawls and tending to force them into engagement with said ratchet, a Y

pawls, means for holding both of said pawls' in engagement with said ratchet when the lifting bar is being raised, means for placing the pawls alternately in engagement with said ratchet when the lifting bar is being lowered, one of said pawls being in engagement at all times when the lifting bar is being lowered under load and said pawls being simultaneously withdrawn when the lifting bar is being lowered free from load.

4. In a lifting jack, a standard, a lifting bar mounted for reciprocation therein, a ratchet adapted to actuate said bar, a handle receiving socket, a pair of pawls pivotally mounted within said handle receiving socket and adapted to engage said ratchet, a lever carried by said socket and adapted to engage said pawls, and means connected between the lever and said socket for simultaneously holding said pawls out of engagement with said ratchet.

5. In a lifting jack, a standard, a lifting bar mounted for reciprocation therein, aratchet adapted to actuate said bar, a handle receiving socket, a pair of pawls pivotally mounted within said handle receiving socket and adapted to engage said ratchet, a pivoted lever carried by said socket and adapted to engage said pawls, means connected between the lever and :said socket for simultaneously holding said pawls out of engagement with said ratchet, and means for disengaging said lever from said pawls.

In testimony whereof l afiix my signature in presence of two witnesses.

LE ROY WILLOUR Witnesses CLYDn C. SHERmH, J. R. RYDER, 

